Certain 1-arylsulfonyl-1, 2, 4-triazoles



United States Patent 3,293,259 CERTAIN 1-ARYLSULFONYL-1,2,4-TRIAZOLES Milton Wolf, West Chester, Pa., assignor to American Home Products Corporation, New York, N.Y., a corporation of Delaware No Drawing. Filed Aug. 13, 1965, Ser. No. 479,643 8 Claims. (Cl. 260-308) This invention is directed to novel compounds classified in the art of organic chemistry as 1,2,4-triazoles and to a process for making these compounds.

In its composition aspect, the claimed invention resides in a composition of matter having a 1,2,4-triazole nucleus having in the 1- or 4-position a phenylsulfonyl substituent or its hereinafter disclosed equivalents.

Viewed in its process aspect, the claimed invention resides in the concept of reacting triazole with an arylsulfonyl halide in the presence of an acid scavenger such as a tertiary amine.

The tangible embodiments of the composition aspect of this invention possess the inherent physical properties of being relatively high melting yellowish to colorless solids, and substantially insoluble in water.

Examination of compounds produced by the hereinafter described process reveals data confirming the molecular structure hereinbefore set forth. For example, the nuclear magnetic resonance spectrum shows the environmental equivalence of the triazole atoms in the case of the 4-arylsulfonyl compounds, while the structure of the l-arylsulfonyl compounds is confirmed by the magnetic non-equivalence of the triazole protons.

The aforementioned physical characteristics, taken together with the nature of the starting materials and the mode of synthesis positively confirm the structure of the compositions sought to be patented.

As determined by pharmacological evaluation using warm blooded animals, the claimed compounds exhibit the applied use characteristic of exerting qualitatively varying therapeutic effects as central nervous system depressants and as hypoglycemics.

The process and the compounds of the claimed invention are further elucidated in the following reaction scheme:

As shown above, the reaction whereby the claimed compounds are productd entails forming a solution of a 1,2,4-triazole (II) and an acid scavenger such as triethylamine in benzene. To this solution is added portionwise a solution of a phenylsulfonyl halide (I) in benzene. If this mixing results in an exothermic reaction, the reaction mixture is cooled to precipitate the halide which forms. This halide is filtered off and the fil- 3,293,259 Patented Dec. 20, 1966 "ice trate is concentrated under vacuum to give the product. Where, with certain phenylsulfonyl halides, the reaction is not exothermic, heat must be supplied. It normally suffices to reflux the reaction mixture for about a half hour in order to complete the reaction. After this time ether and water are added to the reaction mixture in order to precipitate the product.

The claimed compounds can be purified by recrystallization from ethylacetate-cyclohexane or methylcyclohexane-benzene mixtures.

The 1,2,4-triazoles and the phenylsulfonyl halides used in making the claimed compounds are generally known or are readily prepared by procedures well known to those skilled in the art.

The triazoles used in making the claimed compounds can be unsubstituted or can have one or more alkyl, aryl or aralkyl groups in the 3- or the 5-position.

The phenylsulfonyl halide can be a benzenesulfonyl halide, such as the chloride, the bromide or the fluoride. Equivalent to the selected benzenesulfonyl halides are derivatives thereof having on any convenient position on the benzene ring substituents such as alkyl or alkoxy having up to 5 carbon atoms; halogen atoms such as chlorine or fluorine; similarly heteroalkyl sulfonyl halides such as 2-thiophene sulfonyl chloride can be used.

From the above discussion of the starting materials, it will be noted that correspondingly the claimed com- .pounds can bear the enumerated substituents. Such substituted compounds are the full equivalents of the compounds specifically claimed herein and can be used for the same purposes.

The following examples set forth the best mode contemplated by the inventor for carrying out his invention.

Example 1 Five grams of 1,2,4-triazole in 125 ml. of benzene was dried by azeotropic distillation of moisture. The resultant solution ml.) was cooled and treated with 7.4 g. of triethylamine. With stirring a solution of 12.8 g. of benzenesulfonyl chloride in 25 ml. of benzene was added dropwise. The precipitated triethylamine hydrochloride was removed and the remaining solution was concentrated in vacuo, leaving 12.8 g. of white solid, M.P. l08. Upon recrystallization from ethyl acetate-cyclohexane there was obtained 9.6 g. of l-phenylsulfonyl-IH-1,2,4- triazole, M.P. 109.5.

Elemental analysis confirmed the empirical formula:

Example 2 A dry solution of 5 g. of 1,2,4-triazole in 100 ml. of benzene containing 10.1 ml. of triethylamine was slowly treated with 15 g. of p-methoxybenzenesulfonyl chloride in 30 ml. of benzene. The mixture Was heated under reflux for /2 hour. Ether (50 ml.) and water (100 ml.) were added. Insoluble matter was filtered and recrystallized from ethylacetate-cyclohexane to afford 1.4 g. of 4-p-anisulfonyl-4H-1,2,4-triazole, M.P. 128-130".

Elemental analysis confirmed the empirical formula for C H N O S.

The original filtrate was separated into an aqueous portion and an organic portion. The latter was evaporated in vacuo and the resultant solid was recrystallized from methylcyclohexane-benzene to afford 11.2 g. of l-p-anisylsulfonyl-lH-1,2,4-triazole, M.P. 94-95 Elemental analysis confirmed the empirical formula for C H N O S.

l-arylsulfonyl-IH-1,2,4-triazoles were prepared:

2. 1-phenylsulfonyl-l,2,4

-triazole.

3. 4-p-anisylsulfonyl-4H-1,2,4-triazole.

Ex. Starting Materials Substituent in 1- Solv. for Recrystalliza- M.P. 0.)

Position tion 3 p-Toluenesulfonyl Chloride+1,2,4-Triazole p-Tolylsulfonyl Elgiyl Acetate-Cyclo- 143-145 exane.

4 p-Chlorobenzenesulfonyl Chloride+1,2,4- p-Ohlorophenylsul- Ethyl Acetate 127-128 Triazole. fonyl,

5 p-VlethoxybenzenesulfonylCl11o1ide+3,5- p-Anisylsulfonyl 107-108 Dimethyl-LZA-Triazole.

6 Be lr iaenesulfonyl Chloride+3,5-Dimethy1-1,2,4- Phenylsulfonyl. Tetrahydrofuran r 97 97.5

riazo e.

7 p-Fluorobenzenesulfonyl Ghloride+3,5-Dip-Fluorophenylsul- Oyclohexane 109-109.5

methyl-1,2,4-Triazole. fonyl.

8 p-g luorolbenzenesulionyl Chloride+1,2,4 7 d0 do 81- 83 nazo e.

9 2,4-xylenesulfonyl Chloride+1,2,4-Triazo1e 2,4-xylylsulfonyl do 80- 81.

10 2,4-xylenesulfonyl Ohl0ride+3,5-Dimethyldo 51- 53 1,2,4-Triazole.

11 By proceeding as in Ex. 1, using 1,2,4-triazole and 2-thiophenesulfonyl chloride, I-(Z-thienylsulfonyl)-1H-1,2,4-triazole is obtained.

12 By proceeding as in Ex. 1, using 3,5-dimethyl- 1,2,4-1;riazole and ez-toluenesulfonyl chloride, 1- benzyIsulfonyl-1H-1,2,4-triazole is obtained.

*Sample was distilled (B.P. 144-153/05 mm.).

active compounds.

of tablets, suspensions or the like.

What is claimed is: 30 1. The compounds selected from the group consisting of NN NNSO:R l u and l n arugula References Cited by the Examiner UNITED STATES PATENTS 4/1965 Horstmann et al. 260-256.5 9/ 1965 WorlTel et a1 -260256.5

OTHER REFERENCES Yamase et aL, Chem. Abstracts, vol. 61, page 4515 and the acid-addition salts thereof, wherein R is selected 40 ALEX MAZEL, Primary E iner, from the group consisting of thienyl, phenyl and X-substituted phenyl, wherein X is selected from the group consisting of lower alkyl, lower alkoxy and halo.

HENRY R. TILES, Examiner.

ALTON D. ROLLINS, Assistant Examiner. 

1. THE COMPOUND SELECTED FROM THE GROUP CONSISTING OF 